An orthodontic maxillary palatal expander device in accord with at least some aspects of the present concepts includes a mid-palatal bar having a first set of connection points configured to permit securement of the mid-palatal bar to the palate and a second set of connection points extending along at least a portion of a length of the mid-palatal bar, the first set of connection points comprising through holes in the mid-palatal bar. A screw assembly includes a left side member, a right side member, at least one arm connector formed in at least one of the left side member or right side member, at least one mid-palatal bar connector configured to releasably connect to the second set of connection points of the mid-palatal bar, and a screw mechanism adapted to, upon activation of the screw mechanism, cause outward lateral movement of the left side member and right side member. At least one arm, having a distal end and a proximal end, is provided, the proximal end being configured to connect to the at least one arm connector formed in the screw assembly. At least one tooth attachment member is provided and includes a connector configured to connect to the distal end of the at least one arm.
